OPTIMUM FREQUENCY DISTRIBUTIONS OF RAINFALL EROSIVITY FACTOR IN IRAN (SHORT TECHNICAL REPORT)

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ZABIHI M.; SADEGHI S.H.R.; VAFAKHAH M.

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Journal: Journal of Water and Soil Conservation Year:2016 | Volume:23 | Issue:1 Page(s): 301-306

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Title

OPTIMUM FREQUENCY DISTRIBUTIONS OF RAINFALL EROSIVITY FACTOR IN IRAN (SHORT TECHNICAL REPORT)

Author(s)

ZABIHI M. | SADEGHI S.H.R. | VAFAKHAH M. | Issue Writer Certificate

Keywords

DESIGN EROSIVITYQ2

FREQUENCY ANALYSISQ2

SPATIAL DISTRIBUTION OF EROSIVITYQ1

STATISTICAL DISTRIBUTIONQ1

TIME SCALEQ2

Abstract

Background and Objectives: Climate as one of the affecting factor on soil erosion has special importance in the assessment and management of soil erosion. Among climatic factors, role of the rain as water erosion beginner is undeniable. On the other hand, evaluation of frequency distributions for rainfall erosivity factor analysis has been less considered. Thus, the present study aimed to identify and evaluate different frequency distributions fitted to the amount of rainfall erosivity factor in monthly, seasonal and annual scales in Iran.Materials and Methods: The entire available rainfall events reported for 20 years in 70 stations were analyzed based on the Wischmeier and Smith erosivity index. The different frequency distributions were then fitted to data in each TIME SCALE and station using the EasyFit software with the help of chi-square test.Results: According to the results, the maximum Gumble distribution was selected as the best fitted distribution in most of months and seasons and 3-parameter lognormal, gamma and 2-parameter lognormal frequency distributions stood in the first rank group among the fitted frequency distributions for annual scale. In addition, stations with more stable rainfall regime and influenced by similar rainfall regimes had less variability in the type of fitted distributions in different TIME SCALEs.Conclusion: According to the findings of the present study, the selection of frequency distributions was influenced by the spatial variations and temporal scales of the rainfall erosivity factor. The selected frequency distributions were therefore dissimilar in different scales and stations. The findings of the present study can effectively facilitate drawing appropriate strategies for soil and water resources management in Iran.

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APA: Copy

ZABIHI, M., SADEGHI, S.H.R., & VAFAKHAH, M.. (2016). OPTIMUM FREQUENCY DISTRIBUTIONS OF RAINFALL EROSIVITY FACTOR IN IRAN (SHORT TECHNICAL REPORT). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 23(1), 301-306. SID. https://sid.ir/paper/156592/en

Vancouver: Copy

ZABIHI M., SADEGHI S.H.R., VAFAKHAH M.. OPTIMUM FREQUENCY DISTRIBUTIONS OF RAINFALL EROSIVITY FACTOR IN IRAN (SHORT TECHNICAL REPORT). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2016;23(1):301-306. Available from: https://sid.ir/paper/156592/en

IEEE: Copy

M. ZABIHI, S.H.R. SADEGHI, and M. VAFAKHAH, “OPTIMUM FREQUENCY DISTRIBUTIONS OF RAINFALL EROSIVITY FACTOR IN IRAN (SHORT TECHNICAL REPORT),” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 23, no. 1, pp. 301–306, 2016, [Online]. Available: https://sid.ir/paper/156592/en

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